From Net Zero to Carbon Circularity: Accounting for Every Kilogram of Carbon

A different way of thinking about carbon, energy and defossilisation The climate challenge is often described as a problem of carbon. More precisely, it is a problem of carbon transfer. For millions of years, large quantities of carbon have remained stored in geological formations as coal, oil and natural gas. Industrial society extracts this geological carbon, converts it into useful energy and products, and ultimately transfers a significant proportion of it into the active atmosphere–ocean–biosphere carbon cycle. The fundamental challenge is therefore not simply the existence or use of carbon. It is the continuing addition of geological carbon to the natural carbon cycle. This distinction is central to Clean Energy and Water Technologies’ concept of defossilisation. From a Linear Carbon Economy to a Circular Carbon Inventory The conventional fossil-energy pathway is fundamentally linear: Geological Carbon → Fuel → Energy → CO₂ → Atmosphere Carbon Recycling Technology (CRT) proposes a different architecture: Carbon Inventory → Fuel → Energy → CO₂ Capture → Fuel Regeneration → Carbon Inventory Hydrogen provides the means of regenerating captured carbon into a reusable fuel through established chemical conversion pathways. The objective is not to claim that an industrial carbon cycle can immediately become perfectly closed. Real plants have capture inefficiencies, purge streams, start-up and shutdown conditions, maintenance losses and measurement uncertainties. Instead, CRT introduces a more practical principle: Keep the carbon in productive circulation for as long as technically and economically possible, and progressively minimise the requirement for new geological carbon. Every time the same carbon is recovered and returned to useful service, another requirement for fresh carbon feedstock can potentially be displaced. Carbon Becomes an Inventory, Not a Consumable This changes the way carbon is viewed within an energy system. In CRT, carbon is not merely purchased as fuel, combusted and discarded. It becomes a managed process inventory. The carbon atom moves through different molecular forms — for example, methane, carbon monoxide and carbon dioxide — but the carbon itself remains subject to the fundamental conservation of mass. This creates an inherent accounting mechanism. At every defined process boundary: Carbon In = Carbon Out + Carbon Accumulation + Accounted Loss If carbon cannot be reconciled, it has not disappeared. It must exist somewhere: in a product stream, storage inventory, purge, leakage, stack emission, process accumulation or measurement discrepancy. This has an important consequence for CRT: A loss of carbon is also ultimately a loss of recyclable fuel inventory. Carbon recovery therefore becomes more than an environmental objective. It becomes an operational and economic requirement. Carbon Accounting Becomes Part of the Process Much contemporary carbon accounting takes place outside the physical process. Fuel consumption and emissions are measured or calculated and subsequently translated into carbon accounts. CRT creates the possibility of something different: carbon accounting embedded within the physical operation of the plant. The carbon-management system can continuously reconcile the quantity of carbon entering, circulating within, leaving and being lost from the defined system boundary. This creates the potential for an auditable carbon mass balance supported by physical process measurements. Future carbon-accounting frameworks may increasingly demand this type of measurement, reconciliation and verification. CRT provides a useful engineering model for exploring how such an approach could operate. A Physical Interpretation of Net Zero Net zero is conventionally defined by balancing greenhouse-gas emissions against removals over an agreed boundary and period. That remains an important accounting framework. CRT introduces an additional engineering question: How much carbon actually leaves the controlled circular system and enters the atmosphere? This leads to the concept of mass-balance net zero. Rather than relying solely on compensating for emissions after they occur, the engineering objective is to minimise the physical loss of carbon from the circulating inventory in the first place. Perfect closure may not initially be achievable. But the direction of improvement becomes measurable: Reduce carbon loss → increase carbon recovery → increase carbon recirculation → reduce fresh geological carbon requirement. Net zero therefore becomes not only an accounting destination but also a measurable engineering trajectory. Giving the Natural Carbon Cycle an Opportunity to Rebalance Nature already operates an enormous carbon cycle between the atmosphere, oceans, soils and biosphere. The industrial problem is that humanity has been adding carbon from geological reservoirs into this active natural cycle. CRT seeks to progressively reduce that additional transfer. It does not depend upon the proposition that every carbon atom can be circulated forever. Nor does it suggest that an engineered system alone can determine the rate at which the global climate system recovers. Its proposition is more fundamental: If humanity progressively reduces the introduction of geological carbon into the natural carbon cycle, while recovering and reusing carbon already brought into productive circulation, anthropogenic pressure on the natural carbon system can be reduced. Natural sinks and planetary processes can then operate under a progressively smaller additional anthropogenic carbon burden. Defossilisation Rather Than Decarbonisation This is why CEWT distinguishes defossilisation from the broader concept of decarbonisation. Carbon itself is indispensable to life, industry and chemistry. The objective is not necessarily to eliminate carbon. The objective is to break the dependence between economic activity and the continuous extraction of geological carbon. CRT therefore rests on five interconnected principles: Defossilisation addresses the source. Carbon recycling addresses the molecule. Carbon inventory management maintains the circulation. Carbon accounting verifies the mass balance. Mass-balance net zero measures progress toward minimising atmospheric carbon loss. Together, these principles suggest a transition from a linear fossil-carbon economy toward an engineered circular-carbon system. The ultimate question may therefore be simpler than the climate debate sometimes suggests: Instead of continually extracting another kilogram of geological carbon, how many times can we productively use the carbon we already have? That is the question Carbon Recycling Technology seeks to answer. Clean Energy and Water Technologies Pty Ltd (CEWT) Carbon Recycling Technology (CRT) is being developed as an integrated carbon-management and energy-system concept. References to mass-balance net zero describe an engineering principle and should not be interpreted as representing an established regulatory definition or certification standard.